Troy A4 Complete Uppr 556 16

The Troy A4 Complete Upper Receiver 556 16-inch is a lightweight, purpose-built AR-15 upper assembly engineered for close quarters combat and tactical operations. Machined from hardened aircraft aluminum with stainless steel components and finished in Mil-Spec hardcoat anodizing, this upper delivers the durability and reliability demanded by law enforcement and military operators. The integrated M-LOK SOCC handguard features an ultra-low profile, snag-free design optimized for rapid movement in confined spaces without catching on gear, doorways, or tactical equipment.

Built to exacting Mil-Spec standards, the A4 upper incorporates a 16-inch barrel profile in 5.56 NATO caliber—a proven combination that balances velocity retention with manageable length for vehicle operations, room clearing, and patrol scenarios. The hardened aircraft aluminum construction keeps overall weight to 4.81 lbs, critical for extended wear and quick target acquisition. M-LOK mounting slots run the full length of the handguard, allowing operators to attach lights, lasers, vertical grips, and other accessories exactly where needed. Stainless steel internal components resist corrosion during wet operations or extended storage.

This upper receiver suits tactical professionals who prioritize modularity, weight savings, and field-proven geometry over aesthetic customization. Law enforcement tactical teams, military personnel, and serious AR-15 builders working in close-quarters or mobile environments benefit most from the compact profile and snag-free design. The 16-inch barrel length complies with federal regulations while maintaining velocity suitable for barrier penetration and terminal performance in duty use.

Troy Industries upper receivers represent a mature design philosophy refined across two decades of combat and patrol feedback. This A4 configuration delivers the essentials—durability, modularity, and ergonomic soundness—without compromises in materials or manufacturing. Whether upgrading an existing lower receiver or building a complete AR platform from scratch, this upper provides a trusted foundation for tactical applications where weight and handling matter.